this is what i found looking for a tutorial on the audio fix
1.The first step is to make sure that you have upgraded your device to official Gingerbread and have root privileges with xRecovery installed. You can follow the video guides here to get root and xRecovery on your device after upgrading to Android 2.3.3 Gingerbread.
2.Now download the Xperia X10 Audio Stutter Fix zip package from here and save the archive on your desktop.
3.Now connect your phone to the computer, mount SD Card and copy the downloaded file to SD Card root.
4.Once done, reboot your device in xRecovery.
5.After you are in xRecovery, go to Install Custom Zip Package and in the resulting menu, select the zip file you earlier copied to SD Card root.
6.Now press OK to install the fix.
7.After the fix is flashed, reboot your device normally using Reboot in System option in recovery.
8.Now once your phone boots, play any song to check if stuttering has ceased.
so i dont know if you tried putting it on sd card or not if you did could you give me some info on what error your getting ?